Results 301 to 310 of about 390,346 (343)

Diffraction efficiency of magnetic hologram

IEEE Transactions on Magnetics, 1972
MnBi thin films have been studied as a magneto-optical memory element. Ordinarily, restricted conditions are required for preparing pure MnBi film with excellent properties and homogeneity. However, in the case of Mn-Bi-Te films, it was found that adopting the proper composition made it easy to prepare homogeneous films, and the figure of merit F/α was
M. Tanaka, T. Ito, Y. Nishimura
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Diffraction efficiency evaluation for diamond turning of harmonic diffractive optical elements

Applied Optics, 2020
Single point diamond turning is a commonly used method for manufacturing harmonic diffractive optical elements (HDOEs). Diffraction efficiency of HDOEs is sensitive to surface-relief profile errors, and a half-round tool can reduce the profile error obviously. Furthermore, the diamond tools also create surface roughness errors.
Peng, Zhou, Changxi, Xue, Chao, Yang, Chang, Liu, Xingguo, Liu   +4 more
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HETG high-order diffraction efficiency

SPIE Proceedings, 1998
Measurements at XRCF produced calibration data of the high orders of the AXAF High Energy Transmission Gratings at several energies. These tests provide a necessary complement to the limited set of laboratory high-order measurements on each of the flight gratings.
Kathryn A. Flanagan, Norbert S. Schulz, Stephen S. Murray, Gisela D. Hartner, Peter Predehl   +4 more
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High-efficiency switchable diffractive lens

SPIE Proceedings, 2006
We demonstrate that, by using circular array of electrode pattern and applying multi-level phase modulation in each zone, a high-efficiency switchable electro-optic diffractive lens using liquid crystal as the active medium can be produced as a switchable eyewear. The lens is flat and the thickness of the liquid crystal is 5 μm.
Guoqiang Li, P. Valley, P. Ayräs, J. Haddock, M. S. Giridhar, D. Mathine, J. Schwiegerling, G. Meredith, Bernard Kippelen, Seppo Honkanen, N. Peyghambarian   +10 more
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Approximate diffraction theories: efficient modeling of diffractive optical elements

Diffractive Optics and Micro-Optics, 2002
A new formulation of the generalized Kirchhoff approximation is presented which provides improved accuracy and a higher flexibility to model surface relief structures. The predicted diffraction amplitude is compared with rigorous coupled wave theory.
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Upper bound of the diffraction efficiency of diffractive phase elements

Optics Letters, 1991
An upper bound of the diffraction efficiency of diffractive elements that only influence the phase of the illumination wave is derived. The derivation only utilizes the specification of the desired diffraction pattern. It is independent of the technique to design and fabricate the diffractive element.
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Design of multilayer diffractive optical elements with polychromatic integral diffraction efficiency

Optics Letters, 2010
What we believe to be a new method for designing multilayer diffractive optical elements (MLDOEs) for wideband with consideration of polychromatic integral diffraction efficiency (PIDE) is presented. The benefit of this method is that the maximum PIDE over the entire waveband for MLDOEs can be obtained.
Changxi, Xue, Qingfeng, Cui
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Diffraction edges perceived efficiency

2010
Today, noise barriers are recognized as the most effective noise minimization measures of road traffic noise near sensitive receptors located in the road surrounding areas. Especially where the urban occupation is characterized by buildings of low height. For higher buildings noise barriers can not be a completely effective solution.
Domingues, M., Antunes, S., Ramos, I., Grilo, A.   +3 more
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Efficient optimization of diffractive optical elements based on rigorous diffraction models

Journal of the Optical Society of America A, 2001
An efficient optimization strategy for the design of diffractive optical elements that is based on rigorous diffraction theory is described. The optimization algorithm combines diffraction models of different degrees of accuracy and computational complexity.
M E, Testorf, M A, Fiddy
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Holograms of high diffraction efficiency

Soviet Journal of Quantum Electronics, 1972
An experimental study was made of the effects of bleaching on holograms. Optimal bleaching conditions made it possible to achieve a high diffraction efficiency (50%) for a hologram which recorded interference of two plane waves. In the case of a hologram of a transparency, it was important to ensure a satisfactory quality of the reconstructed image ...
V I Bobrinev, V K Kozlova, M A Maiorchuk
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